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EnglishThe growth mechanism of thin Ge1-xMnx/Ge(100) diluted magnetic semiconductor films have been studied by reflection high energy electron diffraction (RHEED) technique and correlated to the structural and magnetic properties of the films provided by X-ray diffraction (XRD) and magneto-optical Kerr effect (MOKE), respectively. The RHEED analysis evidenced a transition from a bi-dimensional to a three-dimensional growth mechanism at deposition temperature, T-G, lower than 433 K while XRD characterization showed a polycrystalline structure with Ge grain size depending on T-G. At low T-G (343 K) all the Ge1-xMnx films behaved superparamagnetically, while at T-G = 433 K hysteresis loops were observed, with a maximum Curie temperature of approximate to 250 K, for 0.027 < x < 0.044. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
| Titolo: | Growth process and characterization of magnetic semiconductors based on GeMn alloy films |
| Autori: | |
| Data di pubblicazione: | 2004 |
| Rivista: | |
| Abstract: | The growth mechanism of thin Ge1-xMnx/Ge(100) diluted magnetic semiconductor films have been studied by reflection high energy electron diffraction (RHEED) technique and correlated to the structural and magnetic properties of the films provided by X-ray diffraction (XRD) and magneto-optical Kerr effect (MOKE), respectively. The RHEED analysis evidenced a transition from a bi-dimensional to a three-dimensional growth mechanism at deposition temperature, T-G, lower than 433 K while XRD characterization showed a polycrystalline structure with Ge grain size depending on T-G. At low T-G (343 K) all the Ge1-xMnx films behaved superparamagnetically, while at T-G = 433 K hysteresis loops were observed, with a maximum Curie temperature of approximate to 250 K, for 0.027 < x < 0.044. (C) 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. |
| Handle: | http://hdl.handle.net/11697/597 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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